Photo: The rooftop farm created by Top Leaf Farms at 2201 Dwight Way in Berkeley. Photo: Alix Wall

Whatever challenges a rooftop presents, though, are not apparent to a farming novice visiting the roof on Dwight. One can walk through numerous terraces and see neat rows of crops growing; it looks no different than a regular farm, except for the fact that you can also see the tops of nearby office buildings and past those, the Bay Bridge in the distance.